Duplex electric-welding machine



l. LEDWINKA. DUPLEX ELECTRIC WELDNG MACHINE. APPLICATION FILED APR. 17. m9.

Patented Novi 28, 1922.

2 SHEETS-SHEET I.

I. LEDWINKA.

. DUPLEX ELEGI'RIC WELDING MACHINE.

APPLICATION FILED APR. 1?, I919.

Patented Nov. 28, 1922;

2 SHEETS-SHEET 2.

.50 tally hereinafter set f Patented Nov.2 8,192 2. I 1,436,716

"UNITED? STATES PATENT OFFICE;

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To allwhom itmagl comm: eccqmpenying drawings and finally pointed it known that 1, Joanne: Imowmne, 8. out m the appended claims. cit zen of the United States residing at Referring to the accompanying draw Phllldelglllfl, 1n the county'of adelphie, l State of enngirlvunin, have made a. certain 1g. 1, is it view in side elevation of a..du- 56 new endusei Invention in Duplex Elec-- plex electric welding machine constructed trio-Welding Machines, of which the followin accordance with end embodying the prinin a epecifioation. ci i les of my invention.

1e invention vrelates to duplex electric lg. 2 is a. top plan iew of the some. welding machines. Fig. 3 is a. viewin and elevation looking to The object. of the invention is to provide towards the ri'ght hand end of the machine an electric welding machine ior' -5imulas shownin Figs. 1 and 2. e

tnneouely forming a. plurality of. electric 4 1s e'brpken detail view in section on welds, and which 18 simple in structure imd the line 4, 4, Fig. 2, looking in the direction 16 on? to manipulate and operate; of the arrows. 4

- further object of the invention is to pro- 5 is a broken detail view 1n section vide an arrangement in a duplex eleetric.1ong1 udinullv through. one of the welding welding machine of welding cont iets or eleccontacts or po nts. trodes arranged in cooperet pairs, all of Fig. 6 s a. view in diagram ehowing the mike pairs of contacts or e 7 es heingdiecircuits, of the, primary windings o the posed when in operat on meeriee in the cir-. transformers. cuitce thewelding current. 4 The same part is by theaame A in robject of the invention isto proreference numeral w erever it occurs vide means for eeclu'mg even pressure of throu out theeevenl views. t

the members of all the of contacts or- In e drawing reference numeral 7 doing It electrodes in simulteneouis service applicaneteethe joundntionplate or support upon tion. e e which theverious guts are earned. 8 and A further objectoi the invention is to pro- -9 deeifnnte reepec 'vely two -mnefonners, videmeans which ensign eandellicient for.- one c which, as forexample, 8, being ac bodily ldjnswaf one In oieech pair of upon a standard 10 suitably bolted electrodes sign taneouely tow the ow or otherwise secured to the hose pinto 7., The eruting members of the pairs 0 elect es transformer Qie carried in a frame 11 which for service application. I f 0 is mounted for movement towards and from A further object of the invention mto the standard or frame 10. To ieoilitetetho 86 provide o'eimple and eficlent support for the movement of frame 11 said frame is supplied work while in positiontobencted npon by with rollers 12'whicl 0 rate along, rock the contacts or electrodes and'whioh .fae1l1- rails .18 dis osed longitudlhell 18' of and upon totes the manipulation of the work'm prethe hose pleteor support 7.;3 och fume 10,

' smting various ts thereof to the action .11,- carries a plurality of welding points or 1 ac ofthe wel eec oontncfii I5, 16, 17. The contactsor! A further o of the invention 1s to propoints 14, 1 are carried b frame 10 while vide means which are; simple and eflimentior the contacts or lploints '16, 1 are carried lg mint-fining thewelding etmtmcts or electhe ireme11 evarioue contactaorpo ma are so relatively disposed and arranged so 45 Other obects oithe invention will appear to. eonstitutepans, the contacts or points 14, 05 more fully 16,1:onetttutmgone' H1311! the points 15,-,

The inven on consists substantially in-the 17, conatitut an peir. The work to construction, combination, location and rela-' be welded ie Exposed in the space between tive errangement ofparte .all ae-willhe more, the two frames 10,11 p0 tht the pair! of v rth, as shown'in the welding contacts or points, the members of then the circuit of the the current di strap 19' while 'minals of the strap 20.

. points and gram illustratingl supplies current each of which are dis l in line with each other, are brought into contact with the work on opposite sides thereof. The contacts or points 14, 15, are associated with the transformer 8: while the contacts 16, 17, are associated with the transformer 9 or rather the contacts 14, 15 are associated m or form art of the secondary circuit of the transormer 8, while the contacts 16, 17 areasoci' ated in or constitute a partof the secondary circuit of the transformer 9, audio such relation to each other that while in working position the secondary win of the two transformers and the pairs 0 contacts or; gpints are all in series with each other, the

rcct-ion of flow of current being indicated .--1. In the ar-' by the dotted line 18, see Fi rangement shown, to which, owever, my invention is not to be limited or restricted, a conductor member 19, 20, is straddled over the primary windings an" core of each of the transformers 8, 9, an constitutes the secondaries of saidwrespective transformers,

the contacts or points 14, 15, being in electrical connection. with the terminals of the the contacts of terminals 16, 17 are in electrical connection with the ter- When the two members of the various pairs of contacts are brought into we position or relation with reference tothe material to be welded, secondaries of the two transformers becomes closed, said circuit including the secondaries of both transformers and, being completed through the contact the work inte used between them. This is the relation 0 the ing a weld o eration, the wel accomplished 11 each of points or contacts. By ing the primary windings of the two transformers to the current source current in the secondary circuits of the. transformers which includes the pairs 14, 16 and 15, 17 of welding contacts or into in series therewith will flow in the irection indicated as above stated by the dotted line 18 when the machine ism operation and current is supplied to'the rimaries of the transformers.

In 'g. 6- I have shown a circuitdiaone method of control of the current sup y to the primaries of the transformers. rrent from the mains is controlled initially dicated generally at 21, which, when closed, from current source a, ewitch. 21, wire 6, thence 'des through wires 0, d, the

g hein coo ra in an math 8 P WIIB wirecv su lying" current and'f to life various win mary of the transformer through, wires 9, l, to-the negative s1de of' of the priand thence current source. The other portionof the current supplied through wire 6 flows through wire .su-ms upon the material.

arts dur- I y connect-.

, frame 11 is advanced towards a switch device in-- -the tran thmughwirescth d and wires m and n through the various primary windings of the transformer 9, and thence to return through wires 0, p, 1', It, switch 21 of the wire 1 to the negative side of the current source.

In the Junction! operation ofwclding. machines it quently mppens that one or the other-members of a coo rating pair of contacts may be burned o or in the case of a duplex machine in which a plurality of mum of weldi points or contacts are to simultaneous y operated it sometimes occurs that the 'same thickness of material is not presented between the members of the various pairs of points with the result that when the points are brought into working position they fail to bear with equal pres This is objectionable resulting in destructive arcing and a failure to accomplish an effective welding joint. To overcome his objection I have provided a balancing arrangement, the function of which is to cause the some contact- 'ing pressure of all ofthe contacts or welding' points. The desired pitched in one simple and effective arrangement by mountin one or more of the contact pointsfor yie ding movement while the others are maintained stationary and rigid. Where a duplex welding anon ment is employed containing only two iairs of welding contacts or points it is so cient for practicalpurposes to provide a balancing on rangement for only one of the four contacts or welding points. In the case of the yielding mounting of a contact or welding point prefer to extend said contact or point to a greater distance towards its coo rating contact or'point than that to which contacts or points are extended, and to mount the same upon a. carrier 22, see Figs. 1 and 2, which is normally resend forwardl or towards the space etween the two rames 10, 11 by means of suitable springs 23. This arrangement permits the contact or point 14 or its carrier, to yield and to be-retracted or withdrawn as the wor tiop until the various contactsflor points of the system attain substantially the same degree of pressure on the work.

In practice a suitable switch device is ar-- ranged in-one oftheflcircuit connections of sformer prime circuit and in Fig. 6 I have illustrated sue a switch device at 24 disposed in the return wire connection I. It is immaterial, of course, in what part c the circuit this switch may be located. In

e operation ofthe apparatus this'switci is nothclobd untillmtle coutadfin have bee roug t into we or war relatio:- with res act to the work disposed betwec e other poeithe mem ers of the various pairs of contact or nto.

n order to maintain the welding couture simple. and can be or points properly cooled I provide in accordance with my invention a ver simple arrangement for securing the circu ation of a cooling medium such as water through the electrodes or welding oints. An arrangement embodying my invention in this res ect is shown in Fig. Each contact consists of a body portion 25 and a projecting point portion 26 both formed in one piece and of suitable material. Lon itudinally' through the point portion 26 I dn 1 passages 27, 28, from the outer end surfaces thereof and which channels extend into the body portion 25. I likewise drill radial passages 29, 30, through the body portion 25 from the peripher thereof to 'oin' respectively with the axia or longitu inal channels 27 28. By suitably connecting a water supply pipe 31 for delivering water into the bore 29 a circulation of coolingl medium through the weldin point and t e body thereof is accomplis ed from the supply pipe 31, bore 29, channel 27 channel 28, ore 30, and return pipe connection 32. To close the outer ends of the channels 27 28, I provide the projection or point portion 26 with a cap 33 and this cap or the outer face thereof constitutes the contact portion which engages the work in accomplishing the weld.

This cooling arrangement is exceedingly accomplished very quickly and easily.

In order to move the frame 11 carrying the transformer 9 and its associated welding points 16, 17, bodily towards and from the frame 10 carrying the transformer 8 an the points 14, 15, I provide the base I with standards 34, in which is 3ournaled a short shaft 35 upon which is mounted a suitable operating mem r such for example, as a hand wheel 36. Ilpon shaft 35 is mounted a pinion 37 which meshes with and drives a gear 38 carried by a .shaft 39 which is iournaled in standard 34 and upon which shaft is carried a pi 'on 40 which meshes with a rack bar 41 connected to the frame 11. By this arrangement by suitably manipulating the operatin member 36 the frame 11 may be shifte along track rails 13 to advance the contact points 16, 17, to

. their working positions or to withdraw them from worki osition.

In the han ling of various to be Welded, particularly where of welds are to be forme on the same piece of work, itis desirable to provide means for supporting the work in such manner as to permit the same to be easily shifted from one position to another to receive the successive welds, as for example, when welding up wheels, pulleys, or the like. To accomp ish this result I mount suitable supporting rollers 42 upon the bed plate 7, and in the space between the frame 10, 11, and in a position to form a roller support for the -various kinds of wor d ondaries of both work. To suitably ad'ust the rollers 42 for the base plate 7 is 7 formed with a transverse slot 43 to receive clamping means 44 which clamp the brackets 45 in which the rollers are mounted.

Havin ,now set forth the objects and nature 0 my invention and a construction embodying the principles thereof what I claim as new and useful and of my own invention and desire to secure by Letters Patent is 1. In a duplex electric a stationary and an o movable frame, a trans each frame, a plurality of welding points carried by each frame, the points carried by one frame being arranged to form members of cooperating pairs of points with those carried b the 'other frames, said contact points being arranged in; series with each other in a circuit which includes the secondaries of both transformers, one of the welding points carried by one of said frames being yieldingly mounted with reference to the other point carried by said frame.

2. In a duplex electric welding machine, a stationary and an oppositely disposed movable frame, a transformer carried by each frame, 'a plurality of welding points carried by each frame, the points carried by one frame being arranged to form members of cooperating pairs of points with those carried b the other frames, said contact points being arranged in series with each other in a circuit which includes the sectransformers, and means for movin said movable frame towards and from t e stationary frame, one member only of one of the cooperating pairs of points bein yieldingly mounted.

3. In a uplex electric welding machine, oppositely disposed frames, a transformer carried by eac frame, a plurality of welding points also carried by each frame, the a we ding points on one frame forming members cooperating with .points carried by the other frame to form pairs of contacts between which the work is to be positioned, all of said points beinlg arran ed in series in the secondary win ings 0 both trans-'11s formers, the rimaries of said transformers being couple up in parallel in the exciting circuit.

4. In a duplex electric welding machine, oppositely disposed transformers, a plurality of welding points associated with each transformer, the points associated with one transformer cooperating with points associated with the other'transformer to form cooperating pairs of points, all of said points being disposed .in series in a secondary circuit common to both transformers, the primaries of said transformers being coupled upin arallel in the exciting circuit.

5. In a dup ex electric welding machine,

welding machine, positely disposed ormer carried by oppositely disposed transformers, a plurality of welding points associated with each transformer, the points associated with one transformer coo rating with oints associated with t e other trans ormer to form cooperating pairs of points, all of said points being disposed in series in a secondary circuit common to both transformers, and means to yieldingly support one member only of one pair of said points.

6. In a du lex electric .welding machine, oplpositely dlsposed transformers, a plu- 1 a ity of welding points associated with each transformer, the points associated with one transformer cooperating with oints associated with the other trans ormer to form cooperating pairs of points, all of said points being disposed in series in a secondary circuit common to both transformers, a movable support for one of said points, and means for yieldingly resisting the movement of said suppor 7. In a duplex electric welding machine, opposite] disposed transformers, a plu rality of welding points associated with each transformer, the points associated with one transformer cooperating with points associated with the other transformer to form cooperating pairs of points, all of said points being disposed m series in a secondary circuit common to both transformers, said points including a body and a projecting portion having communicating channels formed therein, and water su ply and delivery pipe connections to and mm said channels. a

8. In a duplex electric welding machine,

a fixed frame and a movable frame, said frames respectively carrying cooperating members of pairs of welding points, and a roller work support disposed between said frames.

9. In a duplex electric weldin a fixed frame and a movable f frames res ectively carrying cooperating members 0 pairs of welding ints, and a roller work support disposed lifdtween said frames, and means for adjusting said roller work supports to accommodate various sizes of work;

10. In a duplex electric welding machine, a fixed frame and a movable frame, said frames respectively carrying cooperatin members of pairs of welding points, a rac connected to said movable frame, caring for operatin said rack, and means or controlling said gearin to shift said movable frame towards and from the fixed frame.

11. In a duplex electric welding machine, a base plate having a transverse slot, roller work sup rts mounted for transverse adjustment in said slots, sets of welding points disposed on opposite sides of said so port, the points of one set cooperating wit the oints of the other set to form pairs, a transormer associated with each set, all of said points when in working position operating to close a circuit constituting the secondary circuit of both transformers.

In testimony whereof I have hereuntoset my hand, on this 14th day of April A. D., 1919.

machine, rame, said JOSEPH LEDWINKA. 

